Magneto-transport properties of dilute granular ferromagnets |
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Authors: | A. Cohen R. Berkovits |
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Affiliation: | The Physics Department and the Minerva center, Bar Ilang University, Ramat Gan 52900, Israel |
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Abstract: | We present magnetoresistance (MR) measurements performed on quench-condensed granular Ni thin films which are on the verge of electric continuity. In these systems, the electric conductivity is believed to be governed by the resistance between a very small number of grains. The films exhibit sharp resistance jumps as a function of magnetic field. We interpret these findings as being the result of magneto-mechanical distortions that occur in single grains which act as bottlenecks in the dilute percolation network. The observed features provide a unique measure of magnetostriction effects in nano-grain structures as well as being able to shed light on some of the properties of regular granular magnetic films. |
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Keywords: | 73.23.&minus b 73.40.Rw 75.50.Cc |
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